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| Experiment design and analysis on the effect of vibration stress relief on the relaxation uniformity of surface stress for an Al alloy plate |
| LIAO Kai1, ZHU Jiahao1, YU Tian1, CHEN Hui1, ZHONG Liping1, GONG Hai2 |
1.SMEE, Central South University of Forestry and Technology, Changsha 410004, China;
2.SMEE, Central South University, Changsha 410083, China |
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Abstract The effect of stress relaxation on the surface stress of materials was investigated by experiments of vibration stress relief (VSR) for a 7075 Al-base alloy thin plate.The surface stress distribution,stress relaxation uniformity and handling strategies were analysed by vibration simulations and X-ray stress measurements.The experiments show that the effective VSR starts from the sub-resonance region of 5th order natural frequency of the vibrating plate,and the VSR causes the surface stress relaxation which is of non-uniformity along the normal direction of pitch line of zero amplitude.The max stress relaxation ratio (SRR) is 18.7% in the places far away from the pitch line,but the min SRR is 4.1% in the places close to the pitch line.According to the harmonic character of vibration mode,the cross-position VSR method was proposed to balance the vibration energy on the surface of samples.The further experimental results show that the uniformity of stress relaxation is greatly improved,the fluctuation of SRR is reduced from previous 14.6% down to present 6.5%,which means the method is practical.The VSR method can also be applied to other lightweight thin-walled components.
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Received: 31 January 2018
Published: 15 January 2019
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